package com.hieu.sql;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;

public class DatabaseOpenHelper extends SQLiteOpenHelper {
	private static String DB_PATH = "/data/data/com.hieu.tripmanager/databases/";

	private static String DB_NAME = "Database.db";
	
	private SQLiteDatabase myDataBase;

	private final Context context;

	public DatabaseOpenHelper(Context context) {
		super(context, DB_NAME, null, 1);
		this.context = context;
	}

	// create database
	public void createDataBase() throws IOException {
		boolean dbExist = checkDataBase();
		if (dbExist) {
		} else {
			this.getReadableDatabase();
			try {
				copyDataBase();
			} catch (IOException e) {
				throw new Error("Error copying database");
			}
		}

	}

	private boolean checkDataBase() {
		SQLiteDatabase checkDB = null;
		try {
			String myPath = DB_PATH + DB_NAME;
			checkDB = SQLiteDatabase.openDatabase(myPath, null,
					SQLiteDatabase.OPEN_READONLY);
		} catch (SQLiteException e) {
			// database does't exist yet.
		}
		if (checkDB != null) {
			checkDB.close();
		}
		return checkDB != null ? true : false;
	}

	private void copyDataBase() throws IOException {

		// Open your local db as the input stream
		InputStream myInput = context.getAssets().open(DB_NAME);

		// Path to the just created empty db
		String outFileName = DB_PATH + DB_NAME;

		// Open the empty db as the output stream
		OutputStream myOutput = new FileOutputStream(outFileName);

		// transfer bytes from the inputfile to the outputfile
		byte[] buffer = new byte[1024];
		int length;
		while ((length = myInput.read(buffer)) > 0) {
			myOutput.write(buffer, 0, length);
		}

		// Close the streams
		myOutput.flush();
		myOutput.close();
		myInput.close();

	}

	public void openDataBase() throws SQLException {

		// Open the database
		String myPath = DB_PATH + DB_NAME;
		myDataBase = SQLiteDatabase.openDatabase(myPath, null,
				SQLiteDatabase.OPEN_READONLY);

	}

	@Override
	public synchronized void close() {
		if (myDataBase != null)
			myDataBase.close();
		super.close();

	}

	@Override
	public void onCreate(SQLiteDatabase db) {

	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

	}

	@Override
	public void onOpen(SQLiteDatabase db) {
		super.onOpen(db);
	}
}
